The total monthly incomes of 20 men is $61600.
45 of them earn the same monthly income each. Each of the remaining men earns 3 times as much per month. Find the difference between the higher monthly income and the lower monthly income.
|
Men with lower incomes |
Men with higher incomes |
Total incomes |
Number |
16 |
4 |
|
Value |
1 u |
3 u |
|
Total value |
16 u |
12 u |
28 u |
Number of men with lower incomes
=
45 x 20
= 16
Number of men with higher incomes
= 20 - 16
= 4
Total monthly incomes
= 16 u + 12 u
= 28 u
28 u = 61600
1 u = 61600 ÷ 28 = 2200
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 2200
= $4400
Answer(s): $4400